Believing in the unseen proves one's belief in Allah, today's sermon reminds worshippers.
"Allah the sublime has magnificently created the universe and made it infinitely expansive," the sermon says.
"He dispersed therein boundless worlds, and his knowledge encompasses all creatures and objects."
As a verse from the Quran points out: "No one in the Heavens and Earth knows the unseen except Allah."
Allah has disclosed some of the unknown realm to the Prophet Mohammed through the Quran, "which neither him nor his people could have ever known before".
Another Quranic verse states: "That is from the news of the unseen which we reveal to you, O Mohammed.
"You knew it not, neither you nor your people, before this. So be patient, indeed, the best outcome is for the righteous."
The Quran describes events that will happen in the future, such as the Day of Resurrection.
"But when there comes the deafening blast on the day a man will flee from his brother and his mother and his father for every man, that day, will be a matter adequate for him," the Quran says.
People should beware of sorcerers and charlatans who claim they know the unseen, the sermon warns.
"They trick people and illegally get their money ... No one knows the unseen except Allah.
"So be cautious not to seek them out, and kindly cooperate with the concerned authorities to report them because they pose a threat to the community and religion."
The Prophet Mohammed once said: "He who visits a diviner [Arraf] and asks him about anything, his prayers extending to forty nights will not be accepted."